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以完美匹配层为边界条件,用复有限元法分析了椭圆空气孔三角形微结构光纤中基模的限制损耗.数值结果表明:当孔间距,空气填充率和空气孔环数增大时,基模的限制损耗减小.从计算结果还可以得出:限制损耗与基模的偏振有关,随着孔间距,空气填充率和孔的椭圆率的增大,y偏振模与x偏振模的限制损耗比也增大.最后,提出了两种可实现光单偏振,单模传输的高非线性微结构光纤.
Using the perfect matching layer as the boundary condition, the finite element method was used to analyze the limiting loss of the fundamental mode in the elliptical air-hole triangular micro-structure fiber.The numerical results show that when the hole spacing, the air filling rate and the air hole ring number increase, From the calculation results, it can also be concluded that the limiting loss is related to the polarization of the fundamental mode. With the increase of the hole spacing, the air filling rate and the ellipticity of the hole, the restrictions of the y-polarization mode and the x-polarization mode The loss ratio is also increased.Finally, two kinds of highly nonlinear microstructured optical fibers that can realize single polarization and single mode transmission are proposed.